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Questions tagged [torque]

The tag has no usage guidance.

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3answers
73 views

why speed is not directly proportional to torque in dc machine?

I have a conceptual doubt about torque-speed relation in a DC motors. It's probably a gap in my thinking but I'm posting this question anyway. As per me "in case of dc machine we see that the armature ...
2
votes
2answers
54 views

Sizing a motor for a conveyor

There is a plethora of information on motor sizing on the internet discussing the rated voltage, current, torque and power of the motor, and how these parameters should be selected based on the load ...
0
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0answers
44 views

Identification of BLDC Motor

I would to know if make sense to obtain the current of the BLDC motor, using the BLDC motor torque measurement. In particular, i'm able to measure the torque of a BLDC motor but not the current that ...
0
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3answers
56 views

Variable Current Draw from motor for torque control [closed]

I am building an electric go-kart. I would like to use regenerative braking. I would like to have a brake pedal that controls the amount of torque (slowing the motor and wheels down) that the back emf ...
1
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1answer
55 views

Calculate torque from current induced in a single phase of a 3 phase AC Induction servo motor

I'm looking to measure the torque or slip angle on an AC induction (asynchronous) servo motor given the current induced in one of its phases. The servo and drive is yaskawa. Example data is shown ...
0
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1answer
65 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
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0answers
23 views

Asynchronous motor with FOC control and torque constant

So, I am studying an application with an asynchronous motor. Attached to the motor i find a driver and the control of the motor is based on the calculation of an equivalent torque constant for the ...
0
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1answer
182 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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0answers
19 views

How to add back emf as part of this sinusoidal commutation equation

I recently found a nice article on sinusoidal commutation which has a simple exposition of the subject. The torque is derived from first principles but the equation seems not to include BEMF. Does ...
2
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0answers
48 views

BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?
0
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2answers
120 views

Estimating torque of AC motor

Given voltage, measured current draw, and RPMs of an AC motor, and an estimated efficiency rating, is it possible to calculate the actual instantaneous output torque? Or is other information required? ...
0
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0answers
23 views

Phase voltage and torque of stepper motor

When I use a chopper type driver for drive a stepper motor how it effect the rated phase voltage? Is there any relation between rated phase voltage and running torque of the stepper?
0
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1answer
47 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
1
vote
1answer
76 views

Problems calculating torque for a motor opening a door

I want to make a device that can open a door from a cabinet. The door is about 4 meters wide and about 0.5 meters high. (if the width causes a problem I can split it in 1 meters section with one motor ...
0
votes
1answer
35 views

Motor selection for high speed rotary actuation

I am trying to select a motor for a high-speed application where I need to rotate a load bearing cylindrical disc at 20,000 rpm. The total mass of the disc along with its load is approximately 1.5 - 2 ...
0
votes
1answer
340 views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
1
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3answers
69 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
0
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0answers
241 views

Run Stepper motor with more torque and smoothly

I have a stepper motor and its torque curve is below. I am trying to get more torque from the motor. Therefore, I decided to setup my driver to half step. I am using an Arduino for generate the ...
0
votes
1answer
62 views

About the torque of mini servo motor

I'd like to automate button pressing on Nintendo DSi for a certain purpose. For this, I think I will use a raspberry pi and a mini servo motor SG-90. My question is, would the SG-90 would give ...
2
votes
2answers
136 views

What is torque-ampere ratio at electric machines? How it is related with machine efficiency?

When I am reading a journal about SRM (switched reluctance machines) it said that outer rotor design has better efficiency due to higher torque ampere ratio. How it is related with efficiency?
1
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4answers
233 views

Induction Motor Torque Slip Characteristics

This question was asked in a interview for Scientist position. For a given T-slip characteristics of an induction motor, I want the same maximum torque but at a lower slip value? Is it even possible?...
0
votes
1answer
127 views

How can I decrease the torque of a stepper motor?

I would like to take a powerful stepper motor, and sometimes weaken it, so it will stall when it hits resistance. I understand that I can reduce torque with microstepping, but it does not seem to be ...
1
vote
1answer
449 views

12 Volt vs a 24 Volt Motor

I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current,...
0
votes
1answer
28 views

DC motor selection criteria: number of poles

I’m designing a system to measure an arbitrary motor torque curve. As an active load, I’m searching for a brushed DC motor that is able to withstand some degree of torque and speed as well as comply ...
1
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1answer
194 views

stepper motor constant speed under load?

Before posting this question I've been looking up google but can't find an answer to this question other than "speed control and torque control". I've done a lot of research on steppers but still don'...
1
vote
1answer
284 views

Locked Rotor Torque

Hi All I am try to produce a torque curve using the standard torque equation, using the parameters given by the manufacturer as in the attached picture. $$Torque =\dfrac{1}{\omega_s}\cdot\dfrac{V_1^...
-1
votes
1answer
156 views

Load torque and Rotor torque

What would happen if the load torque became greater than the rotor torque developed by the motor?
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0answers
31 views

FIT0186 Torque calcution

I am trying to find a strong motor which can deliver a torque at least 0.2Nm and around 130RPM. While trying to find a 6mm shaft geared motor with feedback,the required torque and rotational was ...
1
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0answers
261 views

Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, \$K_T\$ and \$K_V\$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
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votes
1answer
82 views

How do I know what the max volts and amps for this motor [closed]

Got it from the brush roller in a shark vacuum
0
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0answers
72 views

Using a 670Kv outrunner motor, how can I calculate a way to get variable low speed and high torque?

I have an E-flite Power 46, 670Kv outrunner motor (Kv is the shorthand for RPM/volts, it has 3.9A idle current, 40A maximum continuous current, 14.4-19.2 voltage range, 925 watt maximum) but I wish to ...
-1
votes
0answers
81 views

Experimental calculation of torque constant

I would like to calculate the power consumption of a motor: Pm=(ImNτ2pi)/60 where Pm is the power consumption of the motor (mW), Im the electric current used to drive the motor (amps), N the ...
0
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0answers
50 views

dc motor calculation

I'm having trouble with this problem. Suppose the machine was at rest, and a weight of 5 kg was suspended from a horizontal bar of length 80 cm attached to the shaft. What current must be applied to ...
0
votes
1answer
583 views

Tension control using a DC motor

I would like to control the tension of a string attached to the armature of a DC motor. I think the StackExchange thread here does not fully answer my question. Here the schematic (pencil sketch) of a ...
0
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0answers
97 views

finding air gap shear stress in a permanent magnet generator

I have found that the air gap shear stress is a limiting factor when sizing a generator, but how do I find the value for it?
0
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1answer
199 views

gear motor can be used as generator

I am in doubt with a motors operation, I am not sure whether this question could be asked here, I have a car wiper motor with two speed operation,It uses a PM dc motor with worm gear inside, so it is ...
0
votes
1answer
1k views

is there a calculation for no load current on BLDC motor?

I am calculating various values for a range of motors. However, I need to find the no load current of a motor or io to allow me to calculate other values, based on the information I have below for a ...
0
votes
2answers
298 views

Decrease torque of an electric motor

I got this automatic antenna for a project, but the torque is a little too high. It runs on 12V. I've figured the way it works is, it knows to stop when the load increases to a certain point (i.e. ...
1
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0answers
66 views

Stepper motor torque requirements

I have a robot that has a load of 60kg and it has to move using 4 stepper motors. I saw from previous searches that the torque required by the motors to move is Force times the wheel radius. COF = 0....
0
votes
1answer
57 views

How does a motor perform when it is given a load greater than its rated ability?

I have a 24V motor which is rated output of 250W at 2750 rpm (I calculated torque to be .87 Nm). If I have a wheel which needs 1 Nm of torque to retain a speed of 2750 rpm, I assume that the motor ...
0
votes
2answers
535 views

Why does torque increase with rotor current in an AC induction motor?

In my understanding, the EMF induced on the rotor of an AC induction motor induces a current, and the larger this current, the greater the rotor's torque will be. Could someone please explain: why ...
0
votes
1answer
431 views

Asynchronous induction motor, current in stator

My question is, how was \$ I_{stator} \$ found out? Y -connected 3-phase 4-pole induction motor has \$ R_r = 0.5\$ Ohm , and is supplied from a 480V l - l, 60Hz source. It is connected to a load ...
2
votes
1answer
82 views

DC motor characteristics and control

I don't have a lot of experience into detailed / calculated selection of DC motors based on their specs. Now, I'm starting to do it for robotics competitions as I'm progressing to more serious ones. ...
2
votes
1answer
140 views

servo selection for robotic arm [closed]

Hi i´m designing a robotic arm based on this idea of the NOVABOT I only want to change its structural parts by aluminum tubes. In this design 3D model it use the servo hs-311 wish have a max torque of ...
4
votes
2answers
305 views

Calculating total torque of stepper motor to lift and rotate some weight

I am going to design a system that would be control remotely. The system consist of stepper motor and solid cylinder rod of about 30 inches long and needs to lift about 0.5 lb/0.223 kg mean up to 90\$^...
0
votes
1answer
101 views

Power of motor needed to carry 2kg of weight at speed of 10 kmph [closed]

I need to make rc car which can carry a weight of 1-2 kg and can give speed upto 15kmph, can anyone please tell me what should be rpm and torque of motor for this purpose ? Thank You !
0
votes
2answers
707 views

Motor to spin slowly, low torque [closed]

I am trying to find a motor to use to spin a cardboard wheel to drop balls through a hole. I want this to happen pretty slowly, around 10rpm. It also needs almost no torque, as it is spinning ...
0
votes
1answer
106 views

Health index / performance curve of a motor

I am collecting daily data of motors that consists of vibration in three direction x,y,z , RPM, Temperature, kVAh, kWh, kVArh, average voltage (LL), average voltage (LN), average PF, average current ...
0
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2answers
366 views

DC motor speed and torque circuit equation, why is the current changed while voltage constant?

so i have a power window motor with spec the voltage 12V, continues torque 3 N.m, max load current 12A, and 90 RPM. the resistance is 2.5 ohm i understand that torque is correlated with current and ...
1
vote
2answers
2k views

Controlling the “amount” of regenerative braking (variable back torque?)

I have a question I have been wondering about for a while regarding regenerative braking on electric vehicles. If my understanding of electrical motors is correct In a perfect world with no friction ...